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ata: ATA Command Priority Disabled By Default

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Add a sysfs entry to turn on priority information being passed
to a ATA device. By default this feature is turned off.

This patch depends on ata: Enabling ATA Command Priorities

tj: Renamed ncq_prio_on to ncq_prio_enable and removed trivial
    ata_ncq_prio_on() and open-coded the test.

Signed-off-by: Adam Manzanares <adam.manzanares@hgst.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Adam Manzanares
2016-10-17 11:27:30 -07:00
committed by Tejun Heo
parent 8e061784b5
commit 84f95243b5
4 changed files with 73 additions and 1 deletions
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68
drivers/ata/libata-scsi.c
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@@ -271,6 +271,73 @@ DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
ata_scsi_park_show, ata_scsi_park_store);
EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
static ssize_t ata_ncq_prio_enable_show(struct device *device,
struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(device);
struct ata_port *ap;
struct ata_device *dev;
bool ncq_prio_enable;
int rc = 0;
ap = ata_shost_to_port(sdev->host);
spin_lock_irq(ap->lock);
dev = ata_scsi_find_dev(ap, sdev);
if (!dev) {
rc = -ENODEV;
goto unlock;
}
ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
unlock:
spin_unlock_irq(ap->lock);
return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
}
static ssize_t ata_ncq_prio_enable_store(struct device *device,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct scsi_device *sdev = to_scsi_device(device);
struct ata_port *ap;
struct ata_device *dev;
long int input;
unsigned long flags;
int rc;
rc = kstrtol(buf, 10, &input);
if (rc)
return rc;
if ((input < 0) || (input > 1))
return -EINVAL;
ap = ata_shost_to_port(sdev->host);
spin_lock_irqsave(ap->lock, flags);
dev = ata_scsi_find_dev(ap, sdev);
if (unlikely(!dev)) {
rc = -ENODEV;
goto unlock;
}
if (input)
dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
else
dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
unlock:
spin_unlock_irqrestore(ap->lock, flags);
return rc ? rc : len;
}
DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
u8 sk, u8 asc, u8 ascq)
{
@@ -402,6 +469,7 @@ EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
struct device_attribute *ata_common_sdev_attrs[] = {
&dev_attr_unload_heads,
&dev_attr_ncq_prio_enable,
NULL
};
EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);